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Optical recording method having two degrees of reflectivity and a diffraction grating or hologram formed integrally thereon and process for making it

  • US 5,138,604 A
  • Filed: 12/07/1989
  • Issued: 08/11/1992
  • Est. Priority Date: 04/12/1988
  • Status: Expired due to Term
First Claim
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1. An optical recording medium comprising:

  • a substrate; and

    an information recording pattern formed on the substrate, said information recording pattern including a portion of high reflectivity and a portion of low reflectivity, the portion of low reflectivity of the information recording pattern having a diffraction grating or hologram superimposed thereon.

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